Trigonometry is a branch of mathematics that studies relationships between the sides and angles of triangles. Trigonometry is found all throughout geometry, as every straight-sided shape may be ...

Ivo G. Rosenberg, Frank Stenger, A Lower Bound on the Angles of Triangles Constructed by Bisecting the Longest Side, Mathematics of Computation, Vol. 29, No. 130 (Apr., 1975), pp. 390-395 ...

Michael Fox, Napoleon Triangles and Adventitious Angles, The Mathematical Gazette, Vol. 82, No. 495 (Nov., 1998), pp. 413-422 ...